Question

sodium reacts with chlorine gas to form sodium chloride. what mass of sodium chloride is produced if 92.0 g sodium reacts with excess chlorine?

Answer 1

234 g

Explanation:

We know we will need a balanced equation with masses and molar masses, so let’s gather all the information in one place.

M_r: 22.99 58.44

2Na + Cl₂ ⟶ 2NaCl

Mass/g: 92.0

1. Calculate the moles of Na

Moles Na = 92.0 × 1/22.99

Moles Na = 4.002 mol Na

===============

2. Calculate the moles of NaCl

The molar ratio is 2 mol NaCl:2 mol Na.

Moles of NaCl = 4.002 × 2/2

Moles of NaCl = 4.002 mol NaCl

===============

3. Calculate the mass of NaCl

Mass of NaCl = 4.002 × 58.44

Mass of NaCl = 234 g